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Where is Gallifrey?

Answer needs updated to take account of "The Day of the Doctor" & "The Time of the Doctor".

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Gallifrey either no longer exists, or has been sealed off from the rest of spacetime, as a result of the Doctor using the Moment to end the Last Great Time War.
Prior to that, Gallifrey was located in what the Minyans call the Constellation of Kasterborous[1]. But we're not Minyans, so that's not much help. In the novel Human Nature, Gallifrey is often said to be at the core of the Mutter's Spiral (i.e. The Milky Way Galaxy), but Cold Fusion implies it might be out at the edge, while Cat's Cradle: Time's Crucible implies that it's in a "just right" zone between the too-dense-for-life core and the boring spiral arms (where Earth is). It seems likely that the planet's physical location is, like its position in time, a bit spacey-wacey. {C}

Kasterborous has always been described as a "constellation". In at least two novels, the Doctor explains that "constellation" has a different meaning to Gallifreyans than to modern humans (but in the future we'll come to understand that their definition is more valid), but he never explains what that different meaning is.

The distance from Earth to Gallifrey has several times been given as 250,000,000 light-years. That puts it outside our galaxy and even outside the local cluster of galaxies, but within the same supercluster as we are. In The Science of Doctor Who[2], it states, "That distance[...]strangely enough coincides with the best estimate astronomers have for the distance to a gravitational anomaly known as the 'Great Attractor'." The book goes on to point out that the 'Great Attractor' is at the centre of the supercluster, has a mass equivalent to "tens of thousands of galaxies" and is suspected of being a black hole. Parsons then refers to the Eye of Harmony, a black hole created by Omega that was the source of the Time Lords' ability to travel in time.

It's also worth noting that, in the Eighth Doctor Adventures novels, the Doctor destroyed Gallifrey and then recreated it, and before that the Time Lords had created a number of duplicate Gallifreys scattered around spacetime as part of the Second War in Heaven. And, even on TV, we know that the Time Lords have the power to easily move planets around (see Trial of a Time Lord, "Journey's End" and "The End of Time", for example). So, there are many ways to account for its "spacey-wacey" lack of a consistent location.